fix(thread-list): Narrow mode, and new selection rules for three-pane

Summary:
Fix bug in apm_wrapper

Refactor model selection so that it's easier to understand the logic for split vs list mode

Test Plan: Run new specs (WIP)

Reviewers: evan

Reviewed By: evan

Differential Revision: https://phab.nylas.com/D1619

internal_packages/settings/lib/apm-wrapper.coffee

@@ -25,7 +25,7 @@ class APMWrapper
     args.push('--no-color')
     new BufferedProcess({command, args, stdout, stderr, exit, options})
 
-  runCommandReturningPackages: (args, callback) ->
+  runCommandReturningPackages: (args, errorMessage, callback) ->
     @runCommand args, (code, stdout, stderr) ->
       if code is 0
         try
@@ -43,7 +43,7 @@ class APMWrapper
   loadInstalled: (callback) ->
     args = ['ls', '--json']
     errorMessage = 'Fetching local packages failed.'
-    apmProcess = @runCommandReturningPackages(args, callback)
+    apmProcess = @runCommandReturningPackages(args, errorMessage, callback)
 
     handleProcessErrors(apmProcess, errorMessage, callback)
 
@@ -54,7 +54,7 @@ class APMWrapper
     args.push('--compatible', version) if semver.valid(version)
     errorMessage = 'Fetching featured packages failed.'
 
-    apmProcess = @runCommandReturningPackages(args, callback)
+    apmProcess = @runCommandReturningPackages(args, errorMessage, callback)
     handleProcessErrors(apmProcess, errorMessage, callback)
 
   loadOutdated: (callback) ->
@@ -63,21 +63,21 @@ class APMWrapper
     args.push('--compatible', version) if semver.valid(version)
     errorMessage = 'Fetching outdated packages and themes failed.'
 
-    apmProcess = @runCommandReturningPackages(args, callback)
+    apmProcess = @runCommandReturningPackages(args, errorMessage, callback)
     handleProcessErrors(apmProcess, errorMessage, callback)
 
   loadPackage: (packageName, callback) ->
     args = ['view', packageName, '--json']
     errorMessage = "Fetching package '#{packageName}' failed."
 
-    apmProcess = @runCommandReturningPackages(args, callback)
+    apmProcess = @runCommandReturningPackages(args, errorMessage, callback)
     handleProcessErrors(apmProcess, errorMessage, callback)
 
   loadCompatiblePackageVersion: (packageName, callback) ->
     args = ['view', packageName, '--json', '--compatible', @normalizeVersion(atom.getVersion())]
     errorMessage = "Fetching package '#{packageName}' failed."
 
-    apmProcess = @runCommandReturningPackages(args, callback)
+    apmProcess = @runCommandReturningPackages(args, errorMessage, callback)
     handleProcessErrors(apmProcess, errorMessage, callback)
 
   getInstalled: ->

internal_packages/thread-list/lib/draft-list.cjsx

@@ -59,6 +59,7 @@ class DraftList extends React.Component
       commands={@commands}
       onDoubleClick={@_onDoubleClick}
       itemPropsProvider={ -> {} }
+      itemHeight={39}
       className="draft-list"
       collection="draft" />
 

internal_packages/thread-list/lib/thread-list-store.coffee

@@ -73,7 +73,7 @@ ThreadListStore = Reflux.createStore
       @setView new DatabaseView Thread, {matchers}, (item) ->
         DatabaseStore.findAll(Message, {threadId: item.id})
 
-    Actions.focusInCollection(collection: 'thread', item: null)
+    Actions.setFocus(collection: 'thread', item: null)
 
   # Inbound Events
 
@@ -128,9 +128,9 @@ ThreadListStore = Reflux.createStore
       task = new AddRemoveTagsTask(thread, ['archive'], ['inbox'])
       Actions.queueTask(task)
       if thread.id is focusedId
-        Actions.focusInCollection(collection: 'thread', item: null)
+        Actions.setFocus(collection: 'thread', item: null)
       if thread.id is keyboardId
-        Actions.focusKeyboardInCollection(collection: 'thread', item: null)
+        Actions.setCursorPosition(collection: 'thread', item: null)
 
     @_view.selection.clear()
 
@@ -175,10 +175,13 @@ ThreadListStore = Reflux.createStore
       nextFocus = null
 
     @_afterViewUpdate.push ->
-      Actions.focusInCollection(collection: 'thread', item: nextFocus)
-      Actions.focusKeyboardInCollection(collection: 'thread', item: nextKeyboard)
+      Actions.setFocus(collection: 'thread', item: nextFocus)
+      Actions.setCursorPosition(collection: 'thread', item: nextKeyboard)
 
   _autofocusForLayoutMode: ->
-    focusedId = FocusedContentStore.focusedId('thread')
-    if WorkspaceStore.layoutMode() is "split" and not focusedId
-      _.defer => Actions.focusInCollection(collection: 'thread', item: @_view.get(0))
+    layoutMode = WorkspaceStore.layoutMode()
+    focused = FocusedContentStore.focused('thread')
+    if layoutMode is 'split' and not focused and @_view.selection.count() is 0
+      item = @_view.get(0)
+      _.defer =>
+        Actions.setFocus({collection: 'thread', item: item})

internal_packages/thread-list/lib/thread-list.cjsx

@@ -44,6 +44,10 @@ class ThreadList extends React.Component
 
   @containerRequired: false
 
+  constructor: (@props) ->
+    @state =
+      style: 'unknown'
+
   componentWillMount: =>
     labelComponents = (thread) =>
       for label in @state.threadLabelComponents
@@ -88,7 +92,29 @@ class ThreadList extends React.Component
       resolver: (thread) =>
         <span className="timestamp">{timestamp(thread.lastMessageTimestamp)}</span>
 
-    @columns = [c1, c2, c3, c4]
+    @wideColumns = [c1, c2, c3, c4]
+
+    cNarrow = new ListTabular.Column
+      name: "Item"
+      resolver: (thread) =>
+        pencil = []
+        hasDraft = _.find (thread.metadata ? []), (m) -> m.draft
+        if hasDraft
+          pencil = <RetinaImg name="icon-draft-pencil.png" className="draft-icon" mode={RetinaImg.Mode.ContentPreserve} />
+
+        <div>
+          <div style={display: 'flex'}>
+            <ThreadListIcon thread={thread} />
+            <ThreadListParticipants thread={thread} />
+            <span className="timestamp">{timestamp(thread.lastMessageTimestamp)}</span>
+            {pencil}
+          </div>
+          <div className="subject">{subject(thread.subject)}</div>
+          <div className="snippet">{thread.snippet}</div>
+        </div>
+
+    @narrowColumns = [cNarrow]
+
     @commands =
       'core:remove-item': @_onArchive
       'core:remove-and-previous': -> Actions.archiveAndPrevious()
@@ -100,15 +126,42 @@ class ThreadList extends React.Component
       className: classNames
         'unread': item.isUnread()
 
+  componentDidMount: =>
+    window.addEventListener('resize', @_onResize, true)
+    @_onResize()
+
+  componentWillUnmount: =>
+    window.removeEventListener('resize', @_onResize)
+
   render: =>
-    <MultiselectList
-      dataStore={ThreadListStore}
-      columns={@columns}
-      commands={@commands}
-      itemPropsProvider={@itemPropsProvider}
-      className="thread-list"
-      scrollTooltipComponent={ThreadListScrollTooltip}
-      collection="thread" />
+    if @state.style is 'wide'
+      <MultiselectList
+        dataStore={ThreadListStore}
+        columns={@wideColumns}
+        commands={@commands}
+        itemPropsProvider={@itemPropsProvider}
+        itemHeight={39}
+        className="thread-list"
+        scrollTooltipComponent={ThreadListScrollTooltip}
+        collection="thread" />
+    else if @state.style is 'narrow'
+      <MultiselectList
+        dataStore={ThreadListStore}
+        columns={@narrowColumns}
+        commands={@commands}
+        itemPropsProvider={@itemPropsProvider}
+        itemHeight={90}
+        className="thread-list thread-list-narrow"
+        scrollTooltipComponent={ThreadListScrollTooltip}
+        collection="thread" />
+    else
+      <div></div>
+
+  _onResize: (event) =>
+    current = @state.style
+    desired = if React.findDOMNode(@).offsetWidth < 540 then 'narrow' else 'wide'
+    if current isnt desired
+      @setState(style: desired)
 
   # Additional Commands
 

internal_packages/thread-list/stylesheets/thread-list.less

@@ -180,3 +180,33 @@
   background-image:url(../static/images/thread-list/icon-star-hover-@2x.png);
   background-size: 16px;
 }
+
+.thread-list-narrow {
+  .timestamp {
+    flex: 1;
+    order: 100;
+  }
+  .participants {
+    font-size: @font-size-base;
+  }
+  .thread-icon {
+    margin-right:6px;
+  }
+  .subject {
+    font-size: @font-size-base;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    text-align: left;
+    padding-top:2px;
+    padding-bottom:2px;
+    margin-left:30px;
+  }
+  .snippet {
+    font-size: @font-size-small;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    opacity: 0.7;
+    text-align: left;
+    margin-left:30px;
+  }
+}

internal_packages/unread-notifications/lib/main.coffee

@@ -58,7 +58,7 @@ module.exports =
           notif.onclick = ->
             atom.displayWindow()
             Actions.focusTag(new Tag(name: "inbox", id: "inbox"))
-            Actions.focusInCollection(collection: 'thread', item: threads[msg.threadId])
+            Actions.setFocus(collection: 'thread', item: threads[msg.threadId])
 
         if newUnreadInInbox.length > 1
           new Notification("#{newUnreadInInbox.length} Unread Messages", {

spec-nylas/components/multiselect-list-interaction-handler-spec.coffee

@@ -0,0 +1,107 @@
+MultiselectListInteractionHandler = require '../../src/components/multiselect-list-interaction-handler'
+WorkspaceStore = require '../../src/flux/stores/workspace-store'
+FocusedContentStore = require '../../src/flux/stores/focused-content-store'
+Thread = require '../../src/flux/models/thread'
+Actions = require '../../src/flux/actions'
+_ = require 'underscore'
+
+describe "MultiselectListInteractionHandler", ->
+  beforeEach ->
+    @item = new Thread(id:'123')
+    @itemFocus = new Thread({id: 'focus'})
+    @itemKeyboardFocus = new Thread({id: 'keyboard-focus'})
+    @itemAfterFocus = new Thread(id:'after-focus')
+    @itemAfterKeyboardFocus = new Thread(id:'after-keyboard-focus')
+
+    data = [@item, @itemFocus, @itemAfterFocus, @itemKeyboardFocus, @itemAfterKeyboardFocus]
+
+    @dataView =
+      selection:
+        toggle: jasmine.createSpy('toggle')
+        expandTo: jasmine.createSpy('expandTo')
+        walk: jasmine.createSpy('walk')
+      get: (idx) ->
+        data[idx]
+      getById: (id) ->
+        _.find data, (item) -> item.id is id
+      indexOfId: (id) ->
+        _.findIndex data, (item) -> item.id is id
+      count: -> data.length
+
+    @collection = 'threads'
+    @handler = new MultiselectListInteractionHandler(@dataView, @collection)
+    @isRootSheet = true
+
+    spyOn(WorkspaceStore, 'topSheet').andCallFake => {root: @isRootSheet}
+    spyOn(FocusedContentStore, 'keyboardCursorId').andCallFake -> 'keyboard-focus'
+    spyOn(FocusedContentStore, 'focusedId').andCallFake -> 'focus'
+    spyOn(Actions, 'setFocus')
+    spyOn(Actions, 'setCursorPosition')
+
+  it "should never show focus", ->
+    expect(@handler.shouldShowFocus()).toEqual(false)
+
+  it "should always show the keyboard cursor", ->
+    expect(@handler.shouldShowKeyboardCursor()).toEqual(true)
+
+  describe "onClick", ->
+    it "should focus list items", ->
+      @handler.onClick(@item)
+      expect(Actions.setFocus).toHaveBeenCalledWith({collection: @collection, item: @item})
+
+  describe "onMetaClick", ->
+    it "shoud toggle selection", ->
+      @handler.onMetaClick(@item)
+      expect(@dataView.selection.toggle).toHaveBeenCalledWith(@item)
+
+    it "should focus the keyboard on the clicked item", ->
+      @handler.onMetaClick(@item)
+      expect(Actions.setCursorPosition).toHaveBeenCalledWith({collection: @collection, item: @item})
+
+  describe "onShiftClick", ->
+    it "should expand selection", ->
+      @handler.onShiftClick(@item)
+      expect(@dataView.selection.expandTo).toHaveBeenCalledWith(@item)
+
+    it "should focus the keyboard on the clicked item", ->
+      @handler.onShiftClick(@item)
+      expect(Actions.setCursorPosition).toHaveBeenCalledWith({collection: @collection, item: @item})
+
+  describe "onEnter", ->
+    it "should focus the item with the current keyboard selection", ->
+      @handler.onEnter()
+      expect(Actions.setFocus).toHaveBeenCalledWith({collection: @collection, item: @itemKeyboardFocus})
+
+  describe "onSelect (x key on keyboard)", ->
+    describe "on the root view", ->
+      it "should toggle the selection of the keyboard item", ->
+        @isRootSheet = true
+        @handler.onSelect()
+        expect(@dataView.selection.toggle).toHaveBeenCalledWith(@itemKeyboardFocus)
+
+    describe "on the thread view", ->
+      it "should toggle the selection of the focused item", ->
+        @isRootSheet = false
+        @handler.onSelect()
+        expect(@dataView.selection.toggle).toHaveBeenCalledWith(@itemFocus)
+
+  describe "onShift", ->
+    describe "on the root view", ->
+      beforeEach ->
+        @isRootSheet = true
+
+      it "should shift the keyboard item", ->
+        @handler.onShift(1, {})
+        expect(Actions.setCursorPosition).toHaveBeenCalledWith({collection: @collection, item: @itemAfterKeyboardFocus})
+
+      it "should walk selection if the select option is passed", ->
+        @handler.onShift(1, select: true)
+        expect(@dataView.selection.walk).toHaveBeenCalledWith({current: @itemKeyboardFocus, next: @itemAfterKeyboardFocus})
+
+    describe "on the thread view", ->
+      beforeEach ->
+        @isRootSheet = false
+
+      it "should shift the focused item", ->
+        @handler.onShift(1, {})
+        expect(Actions.setFocus).toHaveBeenCalledWith({collection: @collection, item: @itemAfterFocus})

spec-nylas/components/multiselect-split-interaction-handler-spec.coffee

@@ -0,0 +1,160 @@
+MultiselectSplitInteractionHandler = require '../../src/components/multiselect-split-interaction-handler'
+WorkspaceStore = require '../../src/flux/stores/workspace-store'
+FocusedContentStore = require '../../src/flux/stores/focused-content-store'
+Thread = require '../../src/flux/models/thread'
+Actions = require '../../src/flux/actions'
+_ = require 'underscore'
+
+describe "MultiselectSplitInteractionHandler", ->
+  beforeEach ->
+    @item = new Thread(id:'123')
+    @itemFocus = new Thread({id: 'focus'})
+    @itemKeyboardFocus = new Thread({id: 'keyboard-focus'})
+    @itemAfterFocus = new Thread(id:'after-focus')
+    @itemAfterKeyboardFocus = new Thread(id:'after-keyboard-focus')
+
+    data = [@item, @itemFocus, @itemAfterFocus, @itemKeyboardFocus, @itemAfterKeyboardFocus]
+    @selection = []
+    @dataView =
+      selection:
+        toggle: jasmine.createSpy('toggle')
+        expandTo: jasmine.createSpy('expandTo')
+        add: jasmine.createSpy('add')
+        walk: jasmine.createSpy('walk')
+        clear: jasmine.createSpy('clear')
+        count: => @selection.length
+        items: => @selection
+        top: => @selection[-1]
+
+      get: (idx) ->
+        data[idx]
+      getById: (id) ->
+        _.find data, (item) -> item.id is id
+      indexOfId: (id) ->
+        _.findIndex data, (item) -> item.id is id
+      count: -> data.length
+
+    @collection = 'threads'
+    @handler = new MultiselectSplitInteractionHandler(@dataView, @collection)
+    @isRootSheet = true
+
+    spyOn(WorkspaceStore, 'topSheet').andCallFake => {root: @isRootSheet}
+    spyOn(Actions, 'setFocus')
+    spyOn(Actions, 'setCursorPosition')
+
+  it "should always show focus", ->
+    expect(@handler.shouldShowFocus()).toEqual(true)
+
+  it "should show the keyboard cursor when multiple items are selected", ->
+    @selection = []
+    expect(@handler.shouldShowKeyboardCursor()).toEqual(false)
+    @selection = [@item]
+    expect(@handler.shouldShowKeyboardCursor()).toEqual(false)
+    @selection = [@item, @itemFocus]
+    expect(@handler.shouldShowKeyboardCursor()).toEqual(true)
+
+  describe "onClick", ->
+    it "should focus list items", ->
+      @handler.onClick(@item)
+      expect(Actions.setFocus).toHaveBeenCalledWith({collection: @collection, item: @item})
+
+  describe "onMetaClick", ->
+    describe "when there is currently a focused item", ->
+      beforeEach ->
+        spyOn(FocusedContentStore, 'focused').andCallFake => @itemFocus
+        spyOn(FocusedContentStore, 'focusedId').andCallFake -> 'focus'
+
+      it "should turn the focused item into the first selected item", ->
+        @handler.onMetaClick(@item)
+        expect(@dataView.selection.add).toHaveBeenCalledWith(@itemFocus)
+
+      it "should clear the focus", ->
+        @handler.onMetaClick(@item)
+        expect(Actions.setFocus).toHaveBeenCalledWith({collection: @collection, item: null})
+
+    it "should toggle selection", ->
+      @handler.onMetaClick(@item)
+      expect(@dataView.selection.toggle).toHaveBeenCalledWith(@item)
+
+    it "should call _checkSelectionAndFocusConsistency", ->
+      spyOn(@handler, '_checkSelectionAndFocusConsistency')
+      @handler.onMetaClick(@item)
+      expect(@handler._checkSelectionAndFocusConsistency).toHaveBeenCalled()
+
+  describe "onShiftClick", ->
+    describe "when there is currently a focused item", ->
+      beforeEach ->
+        spyOn(FocusedContentStore, 'focused').andCallFake => @itemFocus
+        spyOn(FocusedContentStore, 'focusedId').andCallFake -> 'focus'
+
+      it "should turn the focused item into the first selected item", ->
+        @handler.onMetaClick(@item)
+        expect(@dataView.selection.add).toHaveBeenCalledWith(@itemFocus)
+
+      it "should clear the focus", ->
+        @handler.onMetaClick(@item)
+        expect(Actions.setFocus).toHaveBeenCalledWith({collection: @collection, item: null})
+
+    it "should expand selection", ->
+      @handler.onShiftClick(@item)
+      expect(@dataView.selection.expandTo).toHaveBeenCalledWith(@item)
+
+    it "should call _checkSelectionAndFocusConsistency", ->
+      spyOn(@handler, '_checkSelectionAndFocusConsistency')
+      @handler.onMetaClick(@item)
+      expect(@handler._checkSelectionAndFocusConsistency).toHaveBeenCalled()
+
+  describe "onEnter", ->
+
+  describe "onSelect (x key on keyboard)", ->
+    it "should call _checkSelectionAndFocusConsistency", ->
+      spyOn(@handler, '_checkSelectionAndFocusConsistency')
+      @handler.onMetaClick(@item)
+      expect(@handler._checkSelectionAndFocusConsistency).toHaveBeenCalled()
+
+  describe "onShift", ->
+    it "should call _checkSelectionAndFocusConsistency", ->
+      spyOn(@handler, '_checkSelectionAndFocusConsistency')
+      @handler.onMetaClick(@item)
+      expect(@handler._checkSelectionAndFocusConsistency).toHaveBeenCalled()
+
+    describe "when the select option is passed", ->
+      it "should turn the existing focused item into a selected item", ->
+        spyOn(FocusedContentStore, 'focused').andCallFake => @itemFocus
+        spyOn(FocusedContentStore, 'focusedId').andCallFake -> 'focus'
+        @handler.onShift(1, {select: true})
+        expect(@dataView.selection.add).toHaveBeenCalledWith(@itemFocus)
+
+      it "should walk the selection to the shift target", ->
+        spyOn(FocusedContentStore, 'focused').andCallFake => @itemFocus
+        spyOn(FocusedContentStore, 'focusedId').andCallFake -> 'focus'
+        @handler.onShift(1, {select: true})
+        expect(@dataView.selection.walk).toHaveBeenCalledWith({current: @itemFocus, next: @itemAfterFocus})
+
+    describe "when one or more items is selected", ->
+      it "should move the keyboard cursor", ->
+        @selection = [@itemFocus, @itemAfterFocus, @itemKeyboardFocus]
+        spyOn(FocusedContentStore, 'keyboardCursor').andCallFake => @itemKeyboardFocus
+        spyOn(FocusedContentStore, 'keyboardCursorId').andCallFake -> 'keyboard-focus'
+        @handler.onShift(1, {})
+        expect(Actions.setCursorPosition).toHaveBeenCalledWith({collection: @collection, item: @itemAfterKeyboardFocus})
+
+    describe "when no items are selected", ->
+      it "should move the focus", ->
+        spyOn(FocusedContentStore, 'focused').andCallFake => @itemFocus
+        spyOn(FocusedContentStore, 'focusedId').andCallFake -> 'focus'
+        @handler.onShift(1, {})
+        expect(Actions.setFocus).toHaveBeenCalledWith({collection: @collection, item: @itemAfterFocus})
+
+
+  describe "_checkSelectionAndFocusConsistency", ->
+    describe "when only one item is selected", ->
+      beforeEach ->
+        spyOn(FocusedContentStore, 'focused').andCallFake -> null
+        spyOn(FocusedContentStore, 'focusedId').andCallFake -> null
+        @selection = [@item]
+
+      it "should clear the selection and make the item focused", ->
+        @handler._checkSelectionAndFocusConsistency()
+        expect(@dataView.selection.clear).toHaveBeenCalled()
+        expect(Actions.setFocus).toHaveBeenCalledWith({collection: @collection, item: @item})

spec-nylas/stores/focused-content-store-spec.coffee

@@ -7,7 +7,7 @@ Actions = require '../../src/flux/actions'
 testThread = new Thread(id: '123')
 
 describe "FocusedContentStore", ->
-  describe "onFocusInCollection", ->
+  describe "onSetFocus", ->
     it "should not trigger if the thread is already focused", ->
       FocusedContentStore._onFocus({collection: 'thread', item: testThread})
       spyOn(FocusedContentStore, 'trigger')

src/components/list-narrow-item.cjsx

@@ -1,43 +0,0 @@
-_ = require 'underscore'
-React = require 'react/addons'
-classNames = require 'classnames'
-{ComponentRegistry} = require 'nylas-exports'
-
-ThreadListItemMixin = require './thread-list-item-mixin'
-
-DefaultParticipants = React.createClass
-  render: ->
-    <div className="participants">
-      {_.pluck(@props.participants, "email").join ", "}
-    </div>
-
-module.exports =
-ThreadListNarrowItem = React.createClass
-  mixins: [ComponentRegistry.Mixin, ThreadListItemMixin]
-  displayName: 'ThreadListNarrowItem'
-  components: ["Participants"]
-
-  render: ->
-    Participants = @state.Participants ? DefaultParticipants
-    <div className={@_containerClasses()} onClick={@_onClick} id={@props.thread.id}>
-      <div className="thread-title">
-        <span className="btn-icon star-button pull-right"
-          onClick={@_toggleStar}
-        ><i className={"fa " + (@_isStarred() and 'fa-star' or 'fa-star-o')}/></span>
-        <div className="message-time">
-          {@threadTime()}
-        </div>
-        <Participants participants={@props.thread.participants} clickable={false}/>
-      </div>
-      <div className="preview-body">
-        <span className="subject">{@_subject()}</span>
-        <span className="snippet">{@_snippet()}</span>
-      </div>
-    </div>
-
-  _containerClasses: ->
-    classNames
-      'unread': @props.unread
-      'selected': @props.selected
-      'thread-list-item': true
-      'thread-list-narrow-item': true

src/components/list-tabular.cjsx

@@ -46,7 +46,7 @@ class ListTabularItem extends React.Component
       <div key={column.name}
            displayName={column.name}
            style={_.pick(column, ['flex', 'width'])}
-           className="list-column">
+           className="list-column list-column-#{column.name}">
         {column.resolver(@props.item, @)}
       </div>
 
@@ -66,11 +66,15 @@ class ListTabular extends React.Component
     columns: React.PropTypes.arrayOf(React.PropTypes.object).isRequired
     dataView: React.PropTypes.object
     itemPropsProvider: React.PropTypes.func
+    itemHeight: React.PropTypes.number
     onSelect: React.PropTypes.func
     onClick: React.PropTypes.func
     onDoubleClick: React.PropTypes.func
 
   constructor: (@props) ->
+    if not @props.itemHeight
+      throw new Error("ListTabular: You must provide an itemHeight - raising to avoid divide by zero errors.")
+
     @state =
       renderedRangeStart: -1
       renderedRangeEnd: -1
@@ -103,7 +107,7 @@ class ListTabular extends React.Component
 
       # If we've shifted enough pixels from our previous scrollTop to require
       # new rows to be rendered, update our state!
-      if Math.abs(@state.scrollTop - @refs.container.scrollTop) >= @_rowHeight() * RangeChunkSize
+      if Math.abs(@state.scrollTop - @refs.container.scrollTop) >= @props.itemHeight * RangeChunkSize
         @updateRangeState()
 
   onDoneReceivingScrollEvents: =>
@@ -114,11 +118,9 @@ class ListTabular extends React.Component
   updateRangeState: =>
     scrollTop = @refs.container.scrollTop
 
-    rowHeight = @_rowHeight()
-
     # Determine the exact range of rows we want onscreen
-    rangeStart = Math.floor(scrollTop / rowHeight)
-    rangeEnd = rangeStart + window.innerHeight / rowHeight
+    rangeStart = Math.floor(scrollTop / @props.itemHeight)
+    rangeEnd = rangeStart + window.innerHeight / @props.itemHeight
 
     # 1. Clip this range to the number of available items
     #
@@ -154,7 +156,7 @@ class ListTabular extends React.Component
 
   render: =>
     innerStyles =
-      height: @props.dataView.count() * @_rowHeight()
+      height: @props.dataView.count() * @props.itemHeight
       pointerEvents: if @state.scrollInProgress then 'none' else 'auto'
 
     <ScrollRegion ref="container" onScroll={@updateScrollState} tabIndex="-1" className="list-container list-tabular" scrollTooltipComponent={@props.scrollTooltipComponent} >
@@ -164,9 +166,6 @@ class ListTabular extends React.Component
       </div>
     </ScrollRegion>
 
-  _rowHeight: =>
-    39
-
   _headers: =>
     return [] unless @props.displayHeaders
 
@@ -182,7 +181,6 @@ class ListTabular extends React.Component
     </div>
 
   _rows: =>
-    rowHeight = @_rowHeight()
     rows = []
 
     for idx in [@state.renderedRangeStart..@state.renderedRangeEnd-1]
@@ -196,7 +194,7 @@ class ListTabular extends React.Component
       rows.push <ListTabularItem key={item.id ? idx}
                                item={item}
                                itemProps={itemProps}
-                               metrics={top: idx * rowHeight, height: rowHeight}
+                               metrics={top: idx * @props.itemHeight, height: @props.itemHeight}
                                columns={@props.columns}
                                onSelect={@props.onSelect}
                                onClick={@props.onClick}

src/components/multiselect-list-interaction-handler.coffee

@@ -0,0 +1,54 @@
+_ = require 'underscore'
+{Actions,
+ WorkspaceStore,
+ FocusedContentStore} = require 'nylas-exports'
+
+module.exports =
+class MultiselectListInteractionHandler
+  constructor: (@dataView, @collection) ->
+
+  shouldShowFocus: ->
+    false
+
+  shouldShowKeyboardCursor: ->
+    true
+
+  onClick: (item) ->
+    Actions.setFocus({collection: @collection, item: item})
+
+  onMetaClick: (item) ->
+    @dataView.selection.toggle(item)
+    Actions.setCursorPosition({collection: @collection, item: item})
+
+  onShiftClick: (item) ->
+    @dataView.selection.expandTo(item)
+    Actions.setCursorPosition({collection: @collection, item: item})
+
+  onEnter: ->
+    keyboardCursorId = FocusedContentStore.keyboardCursorId(@collection)
+    if keyboardCursorId
+      item = @dataView.getById(keyboardCursorId)
+      Actions.setFocus({collection: @collection, item: item})
+
+  onSelect: ->
+    {id} = @_keyboardContext()
+    return unless id
+    @dataView.selection.toggle(@dataView.getById(id))
+
+  onShift: (delta, options = {}) ->
+    {id, action} = @_keyboardContext()
+
+    current = @dataView.getById(id)
+    index = @dataView.indexOfId(id)
+    index = Math.max(0, Math.min(index + delta, @dataView.count() - 1))
+    next = @dataView.get(index)
+
+    action({collection: @collection, item: next})
+    if options.select
+      @dataView.selection.walk({current, next})
+
+  _keyboardContext: ->
+    if WorkspaceStore.topSheet().root
+      {id: FocusedContentStore.keyboardCursorId(@collection), action: Actions.setCursorPosition}
+    else
+      {id: FocusedContentStore.focusedId(@collection), action: Actions.setFocus}

src/components/multiselect-list.cjsx

@@ -11,6 +11,9 @@ Spinner = require './spinner'
  NamespaceStore} = require 'nylas-exports'
 EventEmitter = require('events').EventEmitter
 
+MultiselectListInteractionHandler = require './multiselect-list-interaction-handler'
+MultiselectSplitInteractionHandler = require './multiselect-split-interaction-handler'
+
 ###
 Public: MultiselectList wraps {ListTabular} and makes it easy to present a
 {ModelView} with selection support. It adds a checkbox column to the columns
@@ -32,6 +35,7 @@ class MultiselectList extends React.Component
     columns: React.PropTypes.array.isRequired
     dataStore: React.PropTypes.object.isRequired
     itemPropsProvider: React.PropTypes.func.isRequired
+    itemHeight: React.PropTypes.number.isRequired
     scrollTooltipComponent: React.PropTypes.func
 
   constructor: (@props) ->
@@ -77,21 +81,9 @@ class MultiselectList extends React.Component
         context = {focusedId: @state.focusedId}
         props.commands[key](context)
 
-    unless props.columns[0].name is 'Check'
-      checkmarkColumn = new ListTabular.Column
-        name: "Check"
-        resolver: (thread) =>
-          toggle = (event) =>
-            if event.shiftKey
-              props.dataStore.view().selection.expandTo(thread)
-            else
-              props.dataStore.view().selection.toggle(thread)
-            event.stopPropagation()
-          <div className="checkmark" onClick={toggle}><div className="inner"></div></div>
-      props.columns.splice(0, 0, checkmarkColumn)
-
     @unsubscribers = []
     @unsubscribers.push props.dataStore.listen @_onChange
+    @unsubscribers.push WorkspaceStore.listen @_onChange
     @unsubscribers.push FocusedContentStore.listen @_onChange
     @command_unsubscriber = atom.commands.add('body', commands)
 
@@ -111,18 +103,19 @@ class MultiselectList extends React.Component
       props.className ?= ''
       props.className += " " + classNames
         'selected': item.id in @state.selectedIds
-        'focused': @state.showFocus and item.id is @state.focusedId
-        'keyboard-cursor': @state.showKeyboardCursor and item.id is @state.keyboardCursorId
+        'focused': @state.handler.shouldShowFocus() and item.id is @state.focusedId
+        'keyboard-cursor': @state.handler.shouldShowKeyboardCursor() and item.id is @state.keyboardCursorId
       props
 
     if @state.dataView
       <div className={className}>
         <ListTabular
           ref="list"
-          columns={@props.columns}
+          columns={@state.columns}
           scrollTooltipComponent={@props.scrollTooltipComponent}
           dataView={@state.dataView}
           itemPropsProvider={@itemPropsProvider}
+          itemHeight={@props.itemHeight}
           onSelect={@_onClickItem}
           onDoubleClick={@props.onDoubleClick} />
         <Spinner visible={!@state.ready} />
@@ -135,58 +128,24 @@ class MultiselectList extends React.Component
 
   _onClickItem: (item, event) =>
     if event.metaKey
-      @state.dataView.selection.toggle(item)
-      if @state.showKeyboardCursor
-        Actions.focusKeyboardInCollection({collection: @props.collection, item: item})
+      @state.handler.onMetaClick(item)
     else if event.shiftKey
-      @state.dataView.selection.expandTo(item)
-      if @state.showKeyboardCursor
-        Actions.focusKeyboardInCollection({collection: @props.collection, item: item})
+      @state.handler.onShiftClick(item)
     else
-      Actions.focusInCollection({collection: @props.collection, item: item})
+      @state.handler.onClick(item)
 
   _onEnter: =>
-    return unless @state.showKeyboardCursor
-    item = @state.dataView.getById(@state.keyboardCursorId)
-    if item
-      Actions.focusInCollection({collection: @props.collection, item: item})
+    @state.handler.onEnter()
 
   _onSelect: =>
-    if @state.showKeyboardCursor and @_visible()
-      id = @state.keyboardCursorId
-    else
-      id = @state.focusedId
-
-    return unless id
-    @state.dataView.selection.toggle(@state.dataView.getById(id))
+    @state.handler.onSelect()
 
   _onDeselect: =>
     return unless @_visible()
     @state.dataView.selection.clear()
 
   _onShift: (delta, options = {}) =>
-    if @state.showKeyboardCursor and @_visible()
-      id = @state.keyboardCursorId
-      action = Actions.focusKeyboardInCollection
-    else
-      id = @state.focusedId
-      action = Actions.focusInCollection
-
-    current = @state.dataView.getById(id)
-    index = @state.dataView.indexOfId(id)
-    index = Math.max(0, Math.min(index + delta, @state.dataView.count() - 1))
-    next = @state.dataView.get(index)
-
-    action({collection: @props.collection, item: next})
-
-    if options.select
-      @state.dataView.selection.walk({current, next})
-
-  _visible: =>
-    if WorkspaceStore.layoutMode() is "list"
-      WorkspaceStore.topSheet().root
-    else
-      true
+    @state.handler.onShift(delta, options)
 
   # This onChange handler can be called many times back to back and setState
   # sometimes triggers an immediate render. Ensure that we never render back-to-back,
@@ -198,19 +157,44 @@ class MultiselectList extends React.Component
     , 1
     @_onChangeDebounced()
 
+  _visible: =>
+    if WorkspaceStore.layoutMode() is "list"
+      WorkspaceStore.topSheet().root
+    else
+      true
+
+  _getCheckmarkColumn: =>
+    new ListTabular.Column
+      name: 'Check'
+      resolver: (item) =>
+        toggle = (event) =>
+          if event.shiftKey
+            @state.handler.onShiftClick(item)
+          else
+            @state.handler.onMetaClick(item)
+          event.stopPropagation()
+        <div className="checkmark" onClick={toggle}><div className="inner"></div></div>
+
   _getStateFromStores: (props) =>
     props ?= @props
 
     view = props.dataStore?.view()
     return {} unless view
 
+    columns = [].concat(props.columns)
+
+    if WorkspaceStore.layoutMode() is 'list'
+      handler = new MultiselectListInteractionHandler(view, props.collection)
+      columns.splice(0, 0, @_getCheckmarkColumn())
+    else
+      handler = new MultiselectSplitInteractionHandler(view, props.collection)
+
     dataView: view
+    columns: columns
+    handler: handler
     ready: view.loaded()
     selectedIds: view.selection.ids()
     focusedId: FocusedContentStore.focusedId(props.collection)
     keyboardCursorId: FocusedContentStore.keyboardCursorId(props.collection)
-    showFocus: !FocusedContentStore.keyboardCursorEnabled()
-    showKeyboardCursor: FocusedContentStore.keyboardCursorEnabled()
-
 
 module.exports = MultiselectList

src/components/multiselect-split-interaction-handler.coffee

@@ -0,0 +1,75 @@
+_ = require 'underscore'
+{Actions,
+ WorkspaceStore,
+ FocusedContentStore} = require 'nylas-exports'
+
+module.exports =
+class MultiselectSplitInteractionHandler
+  constructor: (@dataView, @collection) ->
+
+  shouldShowFocus: ->
+    true
+
+  shouldShowKeyboardCursor: ->
+    @dataView.selection.count() > 1
+
+  onClick: (item) ->
+    Actions.setFocus({collection: @collection, item: item})
+    @dataView.selection.clear()
+    @_checkSelectionAndFocusConsistency()
+
+  onMetaClick: (item) ->
+    @_turnFocusIntoSelection()
+    @dataView.selection.toggle(item)
+    @_checkSelectionAndFocusConsistency()
+
+  onShiftClick: (item) ->
+    @_turnFocusIntoSelection()
+    @dataView.selection.expandTo(item)
+    @_checkSelectionAndFocusConsistency()
+
+  onEnter: ->
+
+  onSelect: ->
+    @_checkSelectionAndFocusConsistency()
+
+  onShift: (delta, options) ->
+    if options.select
+      @_turnFocusIntoSelection()
+
+    if @dataView.selection.count() > 0
+      selection = @dataView.selection
+      keyboardId = FocusedContentStore.keyboardCursorId(@collection)
+      id = keyboardId ? @dataView.selection.top().id
+      action = Actions.setCursorPosition
+    else
+      id = FocusedContentStore.focusedId(@collection)
+      action = Actions.setFocus
+
+    current = @dataView.getById(id)
+    index = @dataView.indexOfId(id)
+    index = Math.max(0, Math.min(index + delta, @dataView.count() - 1))
+    next = @dataView.get(index)
+
+    action({collection: @collection, item: next})
+    if options.select
+      @dataView.selection.walk({current, next})
+
+    @_checkSelectionAndFocusConsistency()
+
+  _turnFocusIntoSelection: ->
+    focused = FocusedContentStore.focused(@collection)
+    Actions.setFocus({collection: @collection, item: null})
+    @dataView.selection.add(focused)
+
+  _checkSelectionAndFocusConsistency: ->
+    focused = FocusedContentStore.focused(@collection)
+    selection = @dataView.selection
+
+    if focused and selection.count() > 0
+      @dataView.selection.add(focused)
+      Actions.setFocus({collection: @collection, item: null})
+
+    if selection.count() is 1 and !focused
+      Actions.setFocus({collection: @collection, item: selection.items()[0]})
+      @dataView.selection.clear()

src/flux/actions.coffee

@@ -185,7 +185,7 @@ class Actions
   Actions.selectLayoutMode(collection: 'thread', item: <Thread>)
   ```
   ###
-  @focusKeyboardInCollection: ActionScopeWindow
+  @setCursorPosition: ActionScopeWindow
 
   ###
   Public: Focus on an item in a collection. This action changes the selection
@@ -194,10 +194,10 @@ class Actions
   *Scope: Window*
 
   ```
-  Actions.focusInCollection(collection: 'thread', item: <Thread>)
+  Actions.setFocus(collection: 'thread', item: <Thread>)
   ```
   ###
-  @focusInCollection: ActionScopeWindow
+  @setFocus: ActionScopeWindow
 
   ###
   Public: Focus the interface on a specific {Tag}.
@@ -226,7 +226,7 @@ class Actions
   ###
   Public: Create a new reply to the provided threadId and messageId. Note that
   this action does not focus on the thread, so you may not be able to see the new draft
-  unless you also call {::focusInCollection}.
+  unless you also call {::setFocus}.
 
   *Scope: Window*
 
@@ -435,7 +435,7 @@ class Actions
   ###
   Public: Push a sheet of a specific type onto the Sheet stack maintained by the
   {WorkspaceStore}. Note that sheets have no state. To show a *specific* thread,
-  you should push a Thread sheet and call `focusInCollection` to select the thread.
+  you should push a Thread sheet and call `setFocus` to select the thread.
 
   *Scope: Window*
 

src/flux/stores/focused-content-store.coffee

@@ -18,8 +18,8 @@ selection public so that you can observe focus changes and trigger your own chan
 to focus.
 
 Since {FocusedContentStore} is a Flux-compatible Store, you do not call setters
-on it directly. Instead, use {Actions::focusInCollection} or
-{Actions::focusKeyboardInCollection} to set focus. The FocusedContentStore observes
+on it directly. Instead, use {Actions::setFocus} or
+{Actions::setCursorPosition} to set focus. The FocusedContentStore observes
 these models, changes it's state, and broadcasts to it's observers.
 
 Note: The {FocusedContentStore} triggers when a focused model is changed, even if
@@ -62,8 +62,8 @@ class FocusedContentStore
     @listenTo NamespaceStore, @_onClear
     @listenTo WorkspaceStore, @_onWorkspaceChange
     @listenTo DatabaseStore, @_onDataChange
-    @listenTo Actions.focusInCollection, @_onFocus
-    @listenTo Actions.focusKeyboardInCollection, @_onFocusKeyboard
+    @listenTo Actions.setFocus, @_onFocus
+    @listenTo Actions.setCursorPosition, @_onFocusKeyboard
 
   _resetInstanceVars: =>
     @_focused = {}

src/flux/stores/model-view-selection.coffee

@@ -17,6 +17,9 @@ class ModelViewSelection
   items: ->
     @_items
 
+  top: ->
+    @_items[@_items.length - 1]
+
   clear: ->
     @set([])
 
@@ -49,6 +52,16 @@ class ModelViewSelection
       @_items.push(item)
     @trigger(@)
 
+  add: (item) ->
+    return unless item
+    throw new Error("add must be called with a Model") unless item instanceof Model
+
+    updated = _.reject @_items, (t) -> t.id is item.id
+    updated.push(item)
+    if updated.length isnt @_items.length
+      @_items = updated
+      @trigger(@)
+
   remove: (item) ->
     return unless item
     throw new Error("remove must be called with a Model") unless item instanceof Model

src/flux/stores/workspace-store.coffee

@@ -28,7 +28,7 @@ class WorkspaceStore
 
     @listenTo Actions.selectRootSheet, @_onSelectRootSheet
     @listenTo Actions.selectLayoutMode, @_onSelectLayoutMode
-    @listenTo Actions.focusInCollection, @_onFocusInCollection
+    @listenTo Actions.setFocus, @_onSetFocus
 
     @listenTo Actions.popSheet, @popSheet
     @listenTo Actions.searchQueryCommitted, @popToRootSheet
@@ -74,7 +74,7 @@ class WorkspaceStore
     @_preferredLayoutMode = mode
     @trigger(@)
 
-  _onFocusInCollection: ({collection, item}) =>
+  _onSetFocus: ({collection, item}) =>
     if collection is 'thread'
       if @layoutMode() is 'list'
         if item and @topSheet() isnt Sheet.Thread
@@ -182,7 +182,7 @@ class WorkspaceStore
       @trigger()
 
     if Sheet.Thread and sheet is Sheet.Thread
-      Actions.focusInCollection(collection: 'thread', item: null)
+      Actions.setFocus(collection: 'thread', item: null)
 
   # Return to the root sheet. This method triggers, allowing observers
   # to update.

src/sheet-container.cjsx

@@ -36,7 +36,7 @@ class SheetContainer extends React.Component
 
     <Flexbox direction="column">
       {@_toolbarContainerElement()}
-      
+
       <div name="Header" style={order:1, zIndex: 2}>
         <InjectedComponentSet matching={locations: [topSheet.Header, WorkspaceStore.Sheet.Global.Header]}
                               direction="column"
@@ -89,6 +89,7 @@ class SheetContainer extends React.Component
 
   _onColumnSizeChanged: (sheet) =>
     @refs["toolbar-#{sheet.props.depth}"]?.recomputeLayout()
+    window.dispatchEvent(new Event('resize'))
 
   _onStoreChange: =>
     _.defer => @setState(@_getStateFromStores())
@@ -97,4 +98,4 @@ class SheetContainer extends React.Component
     stack: WorkspaceStore.sheetStack()
 
 
-module.exports = SheetContainer
+module.exports = SheetContainer

static/components/list-tabular.less

@@ -113,7 +113,7 @@
     }
 
     &.keyboard-cursor {
-      .checkmark {
+      .list-column:first-child {
         border-left:4px solid @list-focused-bg;
         padding-left:8px;
       }